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Environmental fate & pathways

Biodegradation in water: screening tests

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Description of key information

The ready biodegradation of MTBAC under the conditions of the carbon dioxide (CO2) evolution test (modified Sturm test) was investigated according to OECD guideline 301B and GLP principles. No significant biodegradation of MTBAC was observed. Therefore it is concluded that the substance was not readily biodegradable under the conditions of the modified Sturm test presently performed.

Key value for chemical safety assessment

Biodegradation in water:
under test conditions no biodegradation observed

Additional information

A single test concentration of 18mg/L (12 mg TOC/L) was tested during 28 days.

Max. 8% biodegradation of MTBAC was observed after 28d.

In the toxicity control more than 25% biodegradation of the reference substance occurred within 14 days (40%, based on ThCO2) indicating that the test substance does not inhibit microbial activity at a nominal concentration of 18 mg/L.

The study is considered to be reliable without restrictions.